/**
 * 练习1
*/
const fp = require('lodash/fp')
const { Maybe, Container} = require('./support')

let maybe = Maybe.of([5, 6, 1])
let ex1 = (value) => {
    maybe.map(fp.map(fp.add(value)))
}

/**
 * 练习2
*/
let xs = Container.of(['do', 'ray', 'me', 'fa', 'so', 'la', 'ti', 'do'])
let ex2 = () => {
   return  xs.map(fp.first)._value
}
// console.log(ex2())

/**
 * 练习3
*/
let safeProp = fp.curry(function (x, o) {
    return Maybe.of(o[x])
})

let user = {id: 2, name: 'Albert'}
let ex3 = () => {
    return fp.flowRight(fp.first, safeProp)(user)
}

/**
 * 练习4
*/
let ex4 = function (n) {
    return Maybe.of(n).map(fp.parseInt)  
}